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06:35
Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
Novel cooperative interactions and structural ordering in H2S-H2.
Timothy A Strobel1, P Ganesh, Maddury Somayazulu
1Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA. tstrobel@ciw.edu
Physical Review Letters
|January 17, 2012
Summary
Hydrogen sulfide and hydrogen form a unique guest-host structure under high pressure. This structure evolves with increasing pressure, developing stronger hydrogen bonds and leading to a novel clathrate material.
Area of Science:
- Materials Science
- Solid-state Chemistry
- High-Pressure Physics
Background:
- Hydrogen sulfide (H2S) and hydrogen (H2) are simple molecules with complex phase behavior under extreme conditions.
- Understanding guest-host interactions in crystalline solids is crucial for materials design.
Purpose of the Study:
- To investigate the structural and bonding evolution of the H2S+H2 system at high pressures.
- To characterize the formation of novel crystalline structures and the role of hydrogen bonding.
Main Methods:
- High-pressure synthesis and X-ray diffraction studies.
- First-principles calculations to model molecular interactions and bonding.
Main Results:
- A guest-host crystalline structure of H2S and H2 was observed starting at 3.5 GPa.
- Increasing pressure promoted the development and strengthening of hydrogen bonding between H2S molecules.
- At 17 GPa, an ordering transition occurred, with H2S molecules maximizing hydrogen bonds and H2 occupying distinct lattice sites, forming a novel clathrate.
Conclusions:
- Intermolecular forces in the H2S+H2 system are tunable with pressure, transitioning from weak van der Waals interactions to strong hydrogen bonding.
- A novel pressure-stabilized clathrate structure is formed, driven by cooperative interactions between H2S and H2 molecules.
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